Safety-valve.



F.V C. BLANCHARD & E. B. CROCKER.

SAFETY VALVE.

APPLICATION man Aue.19. 1914.

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Patented Aug. 24, 1915.

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FREDERICK C. BLANCHARD AND ERNEST B. CROCKER, 0F BRIDG-EPORT, CONNECTICUT, ASSIGNORS TO THE CONSOLIDATED SAFETY VAL-VE COMPANY, 0F BRIDG'EPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT.

SAFETY-VALVE. A

Specication of Letters Patent.'

Patented Aug. 2a, 1915.

To all whom it may concern:

Be it known that we, FREDERICK C.

lBLANCHARD and ERNEST B. CRooxER, citiing or shell detachably secured to said base.

It not infrequently happens in service installation, that the base casting is screwed on to a bushingy or nipple defective by reason of a broken or inaccurately cut thread, thus distorting the body, which distortion being transmitted to the valve seat, which is rigidly connected with said base, causes leakage of the valve. It also frequently happens that when the valve is taken apart for repair, the cylindrical spring casing or shell becomes bent and thrown out of round, with the result that when it is again screwed on to the base, distortion of the valve body results,l which is transmitted to and distorts the valve seat causing the valve to leak.

YDamage of this character often cannot be foreseen and avoided even by the exercise of extraordinary care and attention, and such damage has heretofore been a source of considerable annoyance and expense.

It is the object of this inventlon to provide a valve wherein effective means are provided to prevent leakage of the valve by reason of distortion of the valve seat caused by strains or distortions transmitted thereto from the valve body.

The drawing hereto annexed is a view partly lin section and partly in elevation of a safety valve embodying our invention.

In the drawing the valve body is formed with a relatively heavy base A preferably of hexagonal form and having the usual screw threaded inlet A. Said base is further provided with an upwardlyextending, relatively weak and yielding, tubular wall A2 curved as shown andhaving a circumferential corrugation A", the portion of said wall above said corrugation being externally screw threaded. Said base A is further provided with a relatively high, slender and ylelding cylindrical inner wall A4 having a valve seat B for the valve C which is held upon said seat in the usual manner by the sprlng D surrounding the valve stem E. F 1s .the spring casing or shell having a cylindrlcal depending portion F provided with a circumferential flange F2 screwthreaded to engage the screw threads on the wall A2, the bottom of said casing resting upon the corrugation A3 which forms a seat therefor.

G is the muffler hood mounted on the iiange Fs of the spring casing F.

It will, we believe, be clear that if when the valve is taken apart for repair the casing or shell F through accident or negligence is struck upon its lower edge or otherwise distorted and thrown out of round, any strainsv or distortions of the valve body which result upon the screwing of said damaged casing on to the wall A, are to a great extent dissipated or absorbed by the relatively weak and yielding character of said 'wall and that such distortions as pass said wall are effectively absorbed or rendered negligible by the heavy base A so that they are not .transmitted to the valve seat. Similarly, strains or distortions arising at the bottom of the base A by reason -of the mounting of the valve upon a defective bushing or nipple are to-a great lextent dissipated or absorbed by the relatively heavy base, and such distortions as pass said base are absorbed by the relatively high and yielding wall A4 so that there isno distortion of the valve seat and consequent leakage of the valve.

Our improved construction is simple, easy and economically manufactured, and actual service has demonstrated that itl effectively eliminates the trouble and expense heretofore solely attributable to the transmission of strains and distortions of the valve body to the valve seat.

We claim:

1. In a valve,.a valve body comprising a base and a casnig removably secured thereto, a valve seat connected with said base, and a relatively yielding connection between said base and said casing adapted to absorb distortions of the valve body which would otherwise be transmitted to the valve seat.

- -2. In a valve, a valve body comprising a base and a casing removably secured thereto, a' relatively yielding connection between said base and said casing, a valve seat, a relatively yielding connection between said seat and said base, said connections adapted to .absorb distortionsy of the valve body which would otherwise be transmitted to the valve seat.

3. In a valve, a Valve body comprising a base and a casing, a curved, relatively yielding tubillar wall fast on said base and upon which said casin is removably secured, a cylindrical, relatively yielding inner wall provided on one end with a valve seat and rigidly connected with said base at its other end, said walls adapted to absorb distortions of the valve body which would otherwise be transmitted to the valve seat.

distortions of the valve body which wouldl otherwise be transmitted to the valve seat.4

Signed by us at Brldgeport, Connectlcut, this eleventh day of August, .1914.

FREDERICK C. BLANCHARD. ERNEST B. CROC'KER.

Witnesses:

EUGENE M. MOORE, JOSEPH H. LEDERER. 

